Abstract
UVP (Ultrasonic Velocity Profiler), which uses ultrasonic pulses, is available to opaque fluids and measures instantaneous velocity profile along a measurement line. These are great advantages to HWA and optical methods such as PIV. There are two fundamental algorithms for UVP. The conventional one is “Pulse Doppler method”. This algorithm is versatile and used widely now. The other one is “Correlation method”, which has been devised in order to measure high-speed flow. These method, however, have threshold for low velocity. In this study, we suggest a new algorithm for low speed flow measurement, mm/s order, such as in a natural convection, and investigate performance of the algorithm.
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